Displaying 2 results from an estimated 2 matches for "haaszoology".
2012 Dec 13
3
Repeat elements of matrix based on vector counts
I have two dataframes (df) that share a column header ("plot.id"). In the
1st df, "plot.id" records are repeated a variable number of times based on
the number of trees monitored within each plot. The 2nd df only has a
single record for each "plot.id", and contains a variable named "load" that
is collected at the plot-level and is only listed once per plot
2010 Jun 13
5
Count of unique factors within another factor
I have a data frame with two factors (sampling 'unit', 'species'). I want to
calculate the number of unique 'species' per 'unit.' I can calculate the
number of unique values for each variable separately, but can't get a count
for each ?unit?.
> data=read.csv("C:/Desktop/sr_sort_practice.csv")
> attach(data)
> data[1:10,]
unit species
1